Isolation of a Benzene Valence Isomer with One-Electron Phosphorus-Phosphorus Bonds

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Science  27 Mar 1998:
Vol. 279, Issue 5359, pp. 2080-2082
DOI: 10.1126/science.279.5359.2080

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A tetraphosphabenzene analog of the postulatedanti-tricyclohexylene, a singlet biradical valence isomer of benzene, has been isolated. The tricyclic derivative features one-electron phosphorus-phosphorus bonds, which result from the π*-π* interaction between two diphosphirenyl radicals. Such one-electron bonds may play a wider role in phosphorus chemistry.

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